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One more thought. It is probable that both the netdf-c library and the SD code are using the same hdf-5 library underneath. You might try rebuilding your hdf5 library as thread-safe (there is an hdf5 ./configure option for that). =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: YFO-861586 Department: Support netCDF Priority: Normal Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.